What is the best way to Download Images and texts and use them in my app?

[Mohammad Abu Hmead]

I created an app which load data from server and format it in specific format in android UI components, like text view and image view, but the loading take long time, i want to know what is the best way to decrease the load time and increase the loading speed and the quality of my app, if you know a book name or blog or wiki don't hesitate to till me. If you want to see the developed and published app which I'm talking about, please visit Wasfati app on android market.

Many thanks in advance.